Devoted to the basic and broad understanding of petroleum geoscience, this book integrates the contributions of geology, geophysics and other branches of geoscience into one complete volume. This second edition has been updated to include the latest informatioon on applying the geosciences to reducing the risk in petroleum exploration. Case studies relating to both discovering oil and gas and defining reservoir community after discovery are cited. The book also includes clear explanations of subjects such as biomarkers. This volume is intended for geoscience students, as well as for petroleum geochemists, geologists, geophysicists, engineers, managers and technical personnel.